The water from every toilet that flushes in the Rockaway section of Queens ends up at the Rockaway wastewater treatment plant. But instead of just being treated and dumped in the nearest waterway, Mayor Michael Bloomberg has bigger plans for that waste.

It's part of a pilot program that converts human wastewater into fuel.

"Now we literally have the ability to make gasoline-grade fuel out of waste water," Holloway said. "It's an environmental benefit, and it would reduce energy costs for the agency."

The experiment exposes wastewater to sunlight, causing photosynthesis. The algae that grows is shipped to a lab to be converted to biofuel.

If the technology works and proves cost efficient the city estimates it could power 2,800 cars a day on just 10 percent of the city's waste stream.